摘要
采用Ｎｅｌｄｅｒ环形设计原理进行田间试验设计，应用定性和定量相结合的分析方法，通过对欧美杨密度试验林定株连续测定材料的分析，揭示了密度作用的有关特性。结果表明，对于林木个体，密度作用具有非均衡性，其影响程度顺序为：冠幅＞胸径＞材积＞树高；对于林分，密度作用可使林分平均胸径降低，林木分化程度减弱；密度作用是一个随林龄、林地空间等因素而变化的动态过程，作用效应具有持续积累性。
Using designing principle Nelder annular, tegether with qualitative and qantitative method, analysis of successive tests of fixed trees of P. euramericana plantation were conducted to reveal the function of density and the related characteristics of its effects. The results show that, for the individual trees, density has an unbalanced function and its influencing order is: crown>D. B. H.>volum>tree height; as for the plantation, the function of density can lower down the mean D. B. H. value of the plantation, and the differentiation of stand weakened; density is also a factor whose function changes with the stand age, space in the stand. And its effect result in sustainable accumulation, but ist degree of succesive years function decreases with the increase of stand age and tends to be steady.
出处
《南京林业大学学报（自然科学版）》
CAS
CSCD
1997年第1期13-16,共4页
Journal of Nanjing Forestry University：Natural Sciences Edition
关键词
欧美杨
密度
胸径
冠幅
Populus euramericana
Density
D. B. H .
Crown
